An equivalent circuitry incision way was used to simplify parallel expansionary insert-pipe inside of two-room muffler into equivalent parallel circuitry, which could get their transfer matrix, and then based on Matlab, they were simulated and studied to obtain the insert loss. The experiment showed that it is a good fitness way, which could express the depression of sound in low and center frequency range.
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张永波,黄其柏,周明刚,王勇.并联内插管双室扩张式消声器的插入损失[J].农业机械学报,2007,38(8):49-52.[J]. Transactions of the Chinese Society for Agricultural Machinery,2007,38(8):49-52.